I tried a bunch of stuff to move the interior temp
down in my Vanagon for my dog and windsurfing gear.
Here is my impression of the results, yours may vary:

80 degrees out, van in full sun:

1) 85% Privacy Window Tint(medium dark, on all windows
behind front doors)= -3 degree F internal temperature.

2) Installed solar powered exhaust fan (900 cu.ft./hr)
on roof and louvered vents on sliding side windows
(both sides, for intake, about 4" wide and 14" tall)=
-5 degree F internal temperature, smells so much
better inside.

3) Painted roof white (was metallic blue) with marine
polyurethane paint= -9 degree F internal temperature.

Painting the roof white made the biggest difference
and I think it looks the best.  I did these things in
the above order and still registered such a huge
change with the white roof. I noticed a difference
with the window tint immediately, it just felt a bit
more comfortable inside.  The venting had the same
effect.  However, with the white roof it was like,
wow, I don't believe how nice it is in here!

I did these myself. I actually thought painting the
roof was the quickest, easiest, and least expensive
project.  With some of the new high quality paints you
can roll them on and brush them out and it looks as
good as if it were sprayed, viewing from 12" or more
away.

If you have never done window tinting yourself, its
not very easy to do a clean job.  I would take it to a
pro.

Ben

--- Robert Cardo <rrecardo@WEBTV.NET> wrote:

> It radiates the heat back out of the Van.
>
> That's the purpose of thr tinting.
> Block the suns rays, the heat is out.
>
> Now I'm not gonna tell you the glass isn't going to
> be warm, but the
> glass and the interior will be one heck of a bunch
> cooler with the tint
> than without it.
>

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